Looks like there's an upstream bug against Claws Mail, too: https://www.thewildbeast.co.uk/claws-mail/bugzilla/show_bug.cgi?id=4203
** Bug watch added: Claws Mail bugzilla #4203 http://www.thewildbeast.co.uk/claws-mail/bugzilla/show_bug.cgi?id=4203 -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gtk+2.0 in Ubuntu. https://bugs.launchpad.net/bugs/1808710 Title: !xcb_xlib_threads_sequence_lost error with GTK2 applications To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gtk+2.0/+bug/1808710/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
